This is how I interpret things having read up on this. There are two distinct levels of detail regarding the car models, defined as "race cars" and "production cars".
- Race cars (rally, NASCAR etc.) are completely modeled inside and out, including inside the cabin and under the hood. These have a full damage model, meaning that panels can come flying off the cars. If, for example, a door comes flying off, you will be able to see right into the cabin. If the hood comes flying off, you will be able to see right inside the engine bay.
- Production cars (standard factory spec) are not modeled to such fine details because they have a limited damage model, where panels cannot come flying off the car. These only get scuffs and scratches. As such, there is no need for them to model the engine bay and every part of the cabin because you would never see them anyway.
This is what they mean when referring to "interior view". On race cars, you can see the working innards of the car if panels come off, on production cars you cannot.
Cockpit view is an entirely different thing altogether, and I'm sure that ALL cars in the game will have the view from the drivers seat replicated. However, what is not clear yet, is whether the full damage model on race cars will have a visual impact in terms of what you see in cockpit view...